Clearly shoes and textiles in general are extremely difficult to automate, but you only have to build one shoe building robot, and copy it. Why hasn’t this been done? Expecting a “too hard” answer honestly, but is it really?
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You also need to put down a big whack of capital upfront and will see a return years down the line, hopefully.
With low enough wages, it could easily be financially better to rent a big building in the third world and staff it with actual people.